Validate all entity names <= 256 chars before create/update to server

For all "entity names" (i.e., Actions, Triggers, Packages, Rules, etc.) we should validate (on the client side) that they are less than or equal to 256 characters.

• For example, the Action name (i.e., MUST be less than or equal to 256 characters.

Note: This also means we make sure each part of the namespace is also <= 256 chars.